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RETIREMENT PLANS (Tables) | 12 Months Ended
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Dec. 31, 2019
Retirement Benefits [Abstract] |
Schedule of Change in Benefit Obligation and Plan Assets, Funded Status and Amounts Recognized in Balance Sheet and Accumulated Other Comprehensive Income (Loss) | Below is a summary balance sheet of the change in plan assets during 2019 and 2018, the funded status of the plans and amounts recognized in the Consolidated Statements of Financial Position. Summary of Changes
| Pension Plans |  | Postretirement Benefit Plans
| 2019 |  | 2018 |  | 2019 |  | 2018
(Dollars in millions) | U.S. |  | Non-U.S. |  | U.S. |  | Non-U.S. |  |  |  |
Change in projected benefit obligation: |  |  |  |  |  |  |  |  |  |  |
Benefit obligation, beginning of year | $ | 1,959 |  |  | $ | 840 |  |  | $ | 2,154 |  |  | $ | 893 |  |  | $ | 672 |  |  | $ | 738 |
Service cost | 27 |  |  | 14 |  |  | 35 |  |  | 14 |  |  | — |  |  | — |
Interest cost | 76 |  |  | 20 |  |  | 67 |  |  | 20 |  |  | 25 |  |  | 22 |
Actuarial (gain) loss | 200 |  |  | 113 |  |  | (119 | ) |  | (20 | ) |  | 71 |  |  | (33 | )
Plan participants' contributions | — |  |  | 1 |  |  | — |  |  | 1 |  |  | 10 |  |  | 11 |
Effect of currency exchange | — |  |  | 11 |  |  | — |  |  | (45 | ) |  | 1 |  |  | (1 | )
Benefits paid | (195 | ) |  | (27 | ) |  | (178 | ) |  | (23 | ) |  | (63 | ) |  | (65 | )
Benefit obligation, end of year | $ | 2,067 |  |  | $ | 972 |  |  | $ | 1,959 |  |  | $ | 840 |  |  | $ | 716 |  |  | $ | 672 |
Change in plan assets: |  |  |  |  |  |  |  |  |  |  |
Fair value of plan assets, beginning of year | $ | 1,820 |  |  | $ | 713 |  |  | $ | 2,054 |  |  | $ | 773 |  |  | $ | 135 |  |  | $ | 148 |
Actual return on plan assets | 289 |  |  | 102 |  |  | (61 | ) |  | (19 | ) |  | 27 |  |  | (6 | )
Effect of currency exchange | — |  |  | 9 |  |  | — |  |  | (39 | ) |  | — |  |  | — |
Company contributions | 5 |  |  | 22 |  |  | 5 |  |  | 20 |  |  | 42 |  |  | 43 |
Reserve for third party contributions | — |  |  | — |  |  | — |  |  | — |  |  | (12 | ) |  | 4 |
Plan participants' contributions | — |  |  | 1 |  |  | — |  |  | 1 |  |  | 10 |  |  | 11 |
Benefits paid | (195 | ) |  | (27 | ) |  | (178 | ) |  | (23 | ) |  | (63 | ) |  | (65 | )
Fair value of plan assets, end of year | $ | 1,919 |  |  | $ | 820 |  |  | $ | 1,820 |  |  | $ | 713 |  |  | $ | 139 |  |  | $ | 135 |
Funded status at end of year | $ | (148 | ) |  | $ | (152 | ) |  | $ | (139 | ) |  | $ | (127 | ) |  | $ | (577 | ) |  | $ | (537 | )
Amounts recognized in the Consolidated Statements of Financial Position consist of: |  |  |  |  |  |  |  |  |  |  |
Other noncurrent assets | $ | 13 |  |  | $ | — |  |  | $ | 2 |  |  | $ | — |  |  | $ | 50 |  |  | $ | 41 |
Current liabilities | (3 | ) |  | (1 | ) |  | (4 | ) |  | (1 | ) |  | (47 | ) |  | (45 | )
Post-employment obligations | (158 | ) |  | (151 | ) |  | (137 | ) |  | (126 | ) |  | (580 | ) |  | (533 | )
Net amount recognized, end of year | $ | (148 | ) |  | $ | (152 | ) |  | $ | (139 | ) |  | $ | (127 | ) |  | $ | (577 | ) |  | $ | (537 | )
Accumulated benefit obligation | $ | 2,005 |  |  | $ | 919 |  |  | $ | 1,900 |  |  | $ | 796 |  |  |  |  |
Amounts recognized in accumulated other comprehensive income consist of: |  |  |  |  |  |  |  |  |  |  |
Prior service (credit) cost | $ | 2 |  |  | $ | — |  |  | $ | 2 |  |  | $ | — |  |  | $ | (143 | ) |  | $ | (182 | )
Defined Benefit Plan, Plan with Projected Benefit Obligation in Excess of Plan Assets [Table Text Block] | Information for pension plans with projected benefit obligations in excess of plan assets:
(Dollars in millions) | 2019 |  | 2018
| U.S. |  | Non-U.S. |  | U.S. |  | Non-U.S.
Projected benefit obligation | $ | 1,673 |  |  | $ | 972 |  |  | $ | 1,726 |  |  | $ | 840 |
Fair value of plan assets | 1,512 |  |  | 820 |  |  | 1,585 |  |  | 713 |
Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets [Table Text Block] | Information for pension plans with accumulated benefit obligations in excess of plan assets:
(Dollars in millions) | 2019 |  | 2018
| U.S. |  | Non-U.S. |  | U.S. |  | Non-U.S.
Projected benefit obligation | $ | 1,673 |  |  | $ | 651 |  |  | $ | 1,726 |  |  | $ | 568 |
Accumulated benefit obligation | 1,611 |  |  | 625 |  |  | 1,667 |  |  | 547 |
Fair value of plan assets | 1,512 |  |  | 513 |  |  | 1,585 |  |  | 448 |
Schedule of Benefit Cost and Amounts Recognized in Other Comprehensive Income | Summary of Benefit Costs and Other Amounts Recognized in Other Comprehensive Income
| Pension Plans |  | Postretirement Benefit Plans
| 2019 |  | 2018 |  | 2017 |  | 2019 |  | 2018 |  | 2017
(Dollars in millions) | U.S. |  | Non-U.S. |  | U.S. |  | Non-U.S. |  | U.S. |  | Non-U.S. |  |  |  |  |  |
Components of net periodic benefit (credit) cost: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Service cost | $ | 27 |  |  | $ | 14 |  |  | $ | 35 |  |  | $ | 14 |  |  | $ | 37 |  |  | $ | 13 |  |  | $ | — |  |  | $ | — |  |  | $ | 3 |
Interest cost | 76 |  |  | 20 |  |  | 67 |  |  | 20 |  |  | 66 |  |  | 20 |  |  | 25 |  |  | 22 |  |  | 23 |
Expected return on plan assets | (128 | ) |  | (32 | ) |  | (147 | ) |  | (37 | ) |  | (140 | ) |  | (35 | ) |  | (5 | ) |  | (5 | ) |  | (5 | )
Amortization of: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Prior service (credit) cost | — |  |  | — |  |  | (1 | ) |  | 1 |  |  | (4 | ) |  | 1 |  |  | (39 | ) |  | (40 | ) |  | (40 | )
Mark-to-market pension and other postretirement benefits (gain) loss, net | 39 |  |  | 43 |  |  | 89 |  |  | 36 |  |  | (37 | ) |  | (7 | ) |  | 61 |  |  | (26 | ) |  | 23 |
Net periodic benefit (credit) cost | $ | 14 |  |  | $ | 45 |  |  | $ | 43 |  |  | $ | 34 |  |  | $ | (78 | ) |  | $ | (8 | ) |  | $ | 42 |  |  | $ | (49 | ) |  | $ | 4 |
Other changes in plan assets and benefit obligations recognized in other comprehensive income: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Prior service (credit) cost | $ | — |  |  | $ | — |  |  | $ | (1 | ) |  | $ | 1 |  |  | $ | (4 | ) |  | $ | 1 |  |  | $ | (39 | ) |  | $ | (40 | ) |  | $ | (40 | )
Total | $ | — |  |  | $ | — |  |  | $ | (1 | ) |  | $ | 1 |  |  | $ | (4 | ) |  | $ | 1 |  |  | $ | (39 | ) |  | $ | (40 | ) |  | $ | (40 | )
Schedule of Assumptions Used to Develop the Projected Benefit Obligation | The assumptions used to develop the projected benefit obligation for Eastman's significant U.S. and non-U.S. defined benefit pension plans and U.S. postretirement benefit plans are provided in the following tables.
| Pension Plans |  | Postretirement Benefit Plans
| 2019 |  | 2018 |  | 2017 |  | 2019 |  | 2018 |  | 2017
Weighted-average assumptions used to determine benefit obligations for years ended December 31: | U.S. | Non-U.S. |  | U.S. | Non-U.S. |  | U.S. | Non-U.S. |  |  |  |  |  |
Discount rate | 3.25 | % | 1.56 | % |  | 4.29 | % | 2.35 | % |  | 3.57 | % | 2.25 | % |  | 3.21 | % |  | 4.26 | % |  | 3.54 | %
Rate of compensation increase | 3.25 | % | 2.94 | % |  | 3.25 | % | 2.94 | % |  | 3.25 | % | 2.95 | % |  | 3.25 | % |  | 3.25 | % |  | 3.25 | %
Health care cost trend |  |  |  |  |  |  |  |  |  |  |  |  |  |
Initial |  |  |  |  |  |  |  |  |  | 6.50 | % |  | 6.50 | % |  | 6.75 | %
Decreasing to ultimate trend of |  |  |  |  |  |  |  |  |  | 5.00 | % |  | 5.00 | % |  | 5.00 | %
in year |  |  |  |  |  |  |  |  |  | 2026 |  |  | 2025 |  |  | 2025 |
Weighted-average assumptions used to determine net periodic cost for years ended December 31: | U.S. | Non-U.S. |  | U.S. | Non-U.S. |  | U.S. | Non-U.S. |  |  |  |  |  |
Discount rate | 4.29 | % | 2.35 | % |  | 3.57 | % | 2.25 | % |  | 3.89 | % | 2.33 | % |  | 4.26 | % |  | 3.54 | % |  | 3.91 | %
Discount rate for service cost | 4.32 | % | 2.35 | % |  | 3.64 | % | 2.25 | % |  | 3.89 | % | 2.33 | % |  | 4.05 | % |  | 3.28 | % |  | 4.31 | %
Discount rate for interest cost | 3.96 | % | 2.35 | % |  | 3.18 | % | 2.25 | % |  | 3.24 | % | 2.33 | % |  | 3.93 | % |  | 3.14 | % |  | 3.28 | %
Expected return on assets | 7.43 | % | 4.49 | % |  | 7.48 | % | 4.83 | % |  | 7.49 | % | 5.02 | % |  | 3.75 | % |  | 3.75 | % |  | 3.75 | %
Rate of compensation increase | 3.25 | % | 2.94 | % |  | 3.25 | % | 2.95 | % |  | 3.25 | % | 2.94 | % |  | 3.25 | % |  | 3.25 | % |  | 3.25 | %
Health care cost trend |  |  |  |  |  |  |  |  |  |  |  |  |  |
Initial |  |  |  |  |  |  |  |  |  | 6.50 | % |  | 6.75 | % |  | 7.00 | %
Decreasing to ultimate trend of |  |  |  |  |  |  |  |  |  | 5.00 | % |  | 5.00 | % |  | 5.00 | %
in year |  |  |  |  |  |  |  |  |  | 2025 |  |  | 2025 |  |  | 2021 |
Schedule of Fair Value Measurements of Pension Plan Assets on a Recurring Basis | The following tables reflect the fair value of the defined benefit pension plans assets.
(Dollars in millions) |  |  |  |  | Fair Value Measurements at December 31, 2019
Description | Total Fair Value |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3)
Pension Assets: | U.S. |  | Non-U.S. |  | U.S. |  | Non-U.S. |  | U.S. |  | Non-U.S. |  | U.S. |  | Non-U.S.
Cash & Cash Equivalents (1) | $ | 35 |  |  | $ | 72 |  |  | $ | 35 |  |  | $ | 72 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Public Equity - United States (2) | 1 |  |  | — |  |  | 1 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Other Investments (3) | — |  |  | 57 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 57 |
Total Assets at Fair Value | $ | 36 |  |  | $ | 129 |  |  | $ | 36 |  |  | $ | 72 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 57 |
Investments Measured at Net Asset Value (4) | 1,883 |  |  | 691 |  |  |  |  |  |  |  |  |  |  |  |  |
Total Assets | $ | 1,919 |  |  | $ | 820 |  |  |  |  |  |  |  |  |  |  |  |  |
(Dollars in millions) |  |  |  |  | Fair Value Measurements at December 31, 2018
Description | Total Fair Value |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3)
Pension Assets: | U.S. |  | Non-U.S. |  | U.S. |  | Non-U.S. |  | U.S. |  | Non-U.S. |  | U.S. |  | Non-U.S.
Cash & Cash Equivalents (1) | $ | 16 |  |  | $ | 53 |  |  | $ | 16 |  |  | $ | 53 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Public Equity - United States (2) | 2 |  |  | — |  |  | 2 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Other Investments (3) | — |  |  | 51 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 51 |
Total Assets at Fair Value | $ | 18 |  |  | $ | 104 |  |  | $ | 18 |  |  | $ | 53 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 51 |
Investments Measured at Net Asset Value (4) | 1,802 |  |  | 609 |  |  |  |  |  |  |  |  |  |  |  |  |
Total Assets | $ | 1,820 |  |  | $ | 713 |  |  |  |  |  |  |  |  |  |  |  |  |
(1) | Cash & Cash Equivalents: Funds generally invested in actively managed collective trust funds or interest bearing accounts.
(2) | Public Equity - United States: Common stock equity securities which are primarily valued using a market approach based on the quoted market prices.
(3) | Other Investments: Primarily consist of insurance contracts which are generally valued using a crediting rate that approximates market returns and investments in underlying securities whose market values are unobservable and determined using pricing models, discounted cash flow methodologies, or similar techniques.
(4) | Investments Measured at Net Asset Value: The underlying debt and public equity investments in this category are generally held in common trust funds, which are either actively or passively managed investment vehicles, that are valued at the net asset value per unit/share multiplied by the number of units/shares held as of the measurement date. The other alternative investments in this category are valued under the practical expedient method which is based on the most recently reported net asset value provided by the management of each private investment fund, adjusted as appropriate, for any lag between the date of the financial reports and the measurement date.
The following tables reflect the fair value of the postretirement benefit plan assets. The postretirement benefit plan is for the voluntary employees' beneficiary association ("VEBA") trust the Company assumed as part of the Solutia acquisition.
(Dollars in millions) |  |  | Fair Value Measurements at December 31, 2019
Description | Total Fair Value |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3)
Postretirement Benefit Plan Assets: |  |  |  |  |  |  |
Debt (1): |  |  |  |  |  |  |
Fixed Income (U.S.) | $ | 85 |  |  | $ | — |  |  | $ | 85 |  |  | $ | — |
Fixed Income (Non-U.S.) | 26 |  |  | — |  |  | 26 |  |  | — |
Total | $ | 111 |  |  | $ | — |  |  | $ | 111 |  |  | $ | — |
(Dollars in millions) |  |  | Fair Value Measurements at December 31, 2018
Description | Total Fair Value |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3)
Postretirement Benefit Plan Assets: |  |  |  |  |  |  |
Cash & Cash Equivalents (2) | $ | 3 |  |  | $ | 3 |  |  | $ | — |  |  | $ | — |
Debt (1): |  |  |  |  |  |  |
Fixed Income (U.S.) | 78 |  |  | — |  |  | 78 |  |  | — |
Fixed Income (Non-U.S.) | 26 |  |  | — |  |  | 26 |  |  | — |
Total | $ | 107 |  |  | $ | 3 |  |  | $ | 104 |  |  | $ | — |
(1) | Debt: The fixed income securities are primarily valued upon a market approach, using matrix pricing and considering a security's relationship to other securities for which quoted prices in an active market may be available, or an income approach, converting future cash flows to a single present value amount. Inputs used in developing fair value estimates include reported trades, broker quotes, benchmark yields, and base spreads.
(2) | Cash & Cash Equivalents: Funds generally invested in actively managed collective trust funds or interest bearing accounts.
Schedule of Pension Plan Assets Classified within Level 3 of the Fair Value Hierarchy | The Company valued assets with unobservable inputs (Level 3), primarily insurance contracts, using a crediting rate that approximates market returns and investments in underlying securities whose market values are unobservable and determined using pricing models, discounted cash flow methodologies, or similar techniques.
|  | Fair Value Measurements Using Significant Unobservable Inputs (Level 3)
|  | Other Investments(1)
(Dollars in millions) |  | Non-U.S. Pension Plans
Balance at December 31, 2017 |  | $ | 51 |
Unrealized gains |  | — |
Balance at December 31, 2018 |  | 51 |
Unrealized gains |  | 5 |
Purchases, issuances, sales, and settlements |  | 1 |
Balance at December 31, 2019 |  | $ | 57 |
(1) Primarily consists of insurance contracts.
Schedule of US and Non-US Pension Plans Asset Target Allocation by Category | s. The following table reflects the target allocation for the Company's U.S. and non-U.S. pension and postretirement benefit plans assets for 2020 and the asset allocation at December 31, 2019 and 2018, by asset category.
| U.S. Pension Plans |  | Non-U.S. Pension Plans |  | Postretirement Benefit Plan
| 2020 Target Allocation | Plan Assets at December 31, 2019 | Plan Assets at December 31, 2018 |  | 2020 Target Allocation | Plan Assets at December 31, 2019 | Plan Assets at December 31, 2018 |  | 2020 Target Allocation | Plan Assets at December 31, 2019 | Plan Assets at December 31, 2018
Asset category |  |  |  |  |  |  |  |  |  |  |
Equity securities | 44% | 50% | 43% |  | 24% | 21% | 19% |  | —% | —% | —%
Debt securities | 39% | 37% | 44% |  | 57% | 53% | 54% |  | 100% | 100% | 100%
Real estate | 2% | 2% | 2% |  | 5% | 8% | 8% |  | —% | —% | —%
Other investments (1) | 15% | 11% | 11% |  | 14% | 18% | 19% |  | —% | —% | —%
Total | 100% | 100% | 100% |  | 100% | 100% | 100% |  | 100% | 100% | 100%
(1) U.S. primarily consists of private equity and natural resource and energy related limited partnership investments. Non-U.S. primarily consists of annuity contracts and alternative investments.
Schedule Benefits Expected to be Paid from Pension Plans and Benefits | The estimated future benefit payments, reflecting expected future service, as appropriate, are as follows:
| Pension Plans |  | Postretirement Benefit Plans
(Dollars in millions) | U.S. |  | Non-U.S. |  |
2020 | $ | 197 |  |  | $ | 31 |  |  | $ | 57 |
2021 | 161 |  |  | 30 |  |  | 57 |
2022 | 156 |  |  | 31 |  |  | 53 |
2023 | 151 |  |  | 34 |  |  | 47 |
2024 | 151 |  |  | 38 |  |  | 47 |
2025-2029 | 686 |  |  | 210 |  |  | 223 |

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- Definition Tabular disclosure of one or more of the entity's defined benefit pension plans or one or more other defined benefit postretirement plans, separately for pension plans and other postretirement benefit plans including the entity's schedule of fair value of plan assets for defined benefit or other postretirement plans. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2439-114920 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2410-114920 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2417-114920 + Details
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- Definition Tabular disclosure of the effect of fair value measurements using significant unobservable inputs (Level 3) on changes in plan assets of pension plans and/or other employee benefit plans for the period. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(02) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of benefits expected to be paid by pension plans and/or other employee benefit plans in each of the next five fiscal years and in the aggregate for the five fiscal years thereafter. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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